Variable-speed pulley-drive.



C. P. STRITE.

VARIABLE SPEED PULLEY DRIVE.

APPLIUATIolg FILED Nov.12, 1908.

929,049. Pawnee@ July 27,1909.

2 SHEETS-SHEET 1.

' G. l?. STRITE.

VAEABLE SPEED PULLEY DRIVE.

APPLICATION FILED NOV. l2, 190B.

929,049. Patented Ju1y27, 1909.

2 SHEETS-SHEET 2.

potessimo;

unirn As'rrs .artnr onirica.

oriARLEs P. srarrn, or CEDAR RAPIDS, Iowa vARrABLE-SPEED PULLEr-Dnrvn.

Specicaton of Letter-'s Patent. Application led November 12, 119:08@.Seria-1 o. 462,325'.4

l remitted July 27,1909..

i To all 'whom-it may concern;

.govern the speed of said holes at the inner vBe it known that I,CHARLES P. S'rnrru, a citizen. of the-United States, residing atl Cedar.Rapids, in the county of Linn and State oflowa, have I invented-certainnew andfu'seful 'Improvements in Variable-Speed Pulley-Drives, of which`the following is a speci cation. Y A l n This invention relatestomechanismfor the transmission of rotary motion, and has forits object toprovide a driving pulley and connected controlling mechanism adapted todriving pulley regardless ofthe speed of the shaft to which it isattached. Y i

The nature of the invention is fully disclosed in the description andclaims follow ing, reference being `had to the. accompany. ing drawings,in Figure l is a front view of my improved as in use. Fig. 2 is a face-fView of the governing mechanism, as seen endwise ofthe shaft.'

Fig. 1,but with the driving pulley and its', 4 1s a face View of?driving apparatus,

governor in section. Fig. a modied form of the apparatus.

: In the drawing A denotes a line or countershaft, to which a to theshaft is a friction outer face turned truc.

D, the hub of which may radial -movement 1s provided with studs G'fitting loosely into ends of said radial arms. Between theseiends andthe hub are compression springs H, tending to force the arms outwardly.Movement in this direction is limited by straps I bolted to the sides ofthe hub and to the arms, the terminal holes in the straps being a littlelarger than the bolts passing through them, so as to admit of the slightmovement required to free the friction shoes J attached to the outerends of the arms, from contact with the outer face of the frictionpulley. In practice the shoes are concave blocks of hard wood suitablybolted to iia-nges K at the outer ends of the arms. In an opening L ineach arm is mounted a com'ressi'on spring M, one end bearing on across-,bar N and the other onl the nut of an eyebolt O, the eye of whichlof the heavy radial arms.

Fig. 3 is similar to,

constant rotary motion is l imparted by means of the pulley B. Fixed,pulley C, with its Adjacent to thisfA friction Wheel is loosely mounteda vspider be integral with 5 .the hub of the driving pulley E. Theradial' `a-Igirt'sl" of/the spider are separate from the "hul1, andhave, a limited v with respect to it. `For this purpose thc hub' --nectwith yexternal lugs F1 l opposite arm.

is at the opposite end. Engaging theeye of each eye-bolt is a lever' 'Ppivoted to a fulcrum -yoke Q mounted totunn freely on the shaft, pulleyl:extending arms of these levers connect by tog'gle links S with-thearms of. a shifter sleeve T, alsoloosely mounted on the shaft. :This-maybe sliifted'endwise oftheshaft by 'an ordinary shift-lever U, held atany desired point by a notched sector V. v It 1s assumed thatthe shaftrevolves\at the highest required speed. This speed will be held by thedriving pulley so long as the vinward'tension' of the friction shoes isgreat enough to compensate for slippage due to work resistance and thecentrifugal action Tosecure' a lower rate of speed it is only necessaryto move'the shift-lever to the right, more or less. As

-.will be evident,`this relieves the tension of whereupon centrif- 'thecompression springs, 'ugal force acts on the radlal arms, and thefriction device -slips enough to reduce the speed to a point where allthe forces are at -equilibrium. In practice the revolution of thedriving pulley is found to be very uniform at any speed within* therange of the apparatus,and this range is as great as that lof anyordinary-iron-working lathe. The

same principle is illustrated in Fig. 4, but vin this case the requiredspeed of the driv ing pulley (supposed to be behind the figlure) canonly be changed when the apparatus is at rest. The tension springs -Mlconand with eye bolts which pass through similar lugs on the Greater orless tension, with corresponding speed, is of course attained `byturningthe nuts on the eyebolts. This type of driving apparatus is well suitedto centrifugal machines, cream separators, and the like, running at ahigh velocity. The friction clutch mechanism admits of the machinegradually picking up its speed, and this without any slippage of thebelt, and the detriment to the belt that this involves` loo besides theneed ofside iianges on thepull or other device to hold the belt fromley,

machine is getting up running olf while the speed. v

The device is also useful for maintaining uniformity of operating speed,even though the speed of the main shaft varies, and may thereforebecmployed for the transmission ofrotary motion to a dynamo from anirregularly running motor, such as a gasolene engine.

Having lthus described my'invention, I claim'- l. In a variable speeddriving device, the combination with a rotating shaft, of a frictionWheel fixed thereto, a loose pulley adjacent to the friction Wheel,radially movable centrifugal arms attached to said pulley, frictionshoes on said arms to engage the friction Wl1eel,springs tending tobring the friction ,partsn into engagement, levers connecting with saidsprings, a'sliding connection with said levers mounted on the shaft, anda shift-lever connected With said sliding device, substantially as andfor the purpose set forth.

2. In combination with a lrotary shaft, a,

variable speed driving device, comprising a friction Wheel fixed to theshaft, a loosely niounted'pulley adjacent thereto, radially movable armsconnected with said pulley, with friction shoes to bear on the frictionWheel, counteracting springs operating against centrifugal action,levers adapted to vary the tension of said springs, a sliding sleeve 011the shaft, links connecting said sleeve with said levers, a shift leverfor the sleeve, and means for holding said lever at anyy desired point.l

In testlmony whereof ,l' aHiX my signature `in presence of twoWitnesses.

. CHAS. P. STRITE. lVitnesses J. M. ST. JOHN, N. E. NEMECEK.

